*Hazard models
stset risk1 if risk1~=. & acquire~=., id (cowcc) failure (acquire==1)
stcox  nucass, cluster (cowcc) nohr
stcox  nucass  gdpcap g2 industry rivalry allies polity openness chopen5, cluster (cowcc) nohr
stcox  nucass  gdpcap g2 industry rivalry allies polity, cluster (cowcc) nohr

*Substantive
stcox  nucass  gdpcap g2 industry rivalry allies polity openness chopen5, cluster (cowcc) 

*Censored Hazard
stset risk1 if program~=0 & acquire~=., id (cowcc) failure (acquire==1)
stcox  nucass  gdpcap g2 industry rivalry allies polity openness chopen5, cluster (cowcc) nohr

*Substantive
stcox  nucass  gdpcap g2 industry rivalry allies polity openness chopen5, cluster (cowcc) 




